<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>reactangle</title>
  <link rel="stylesheet" href="./layout.css">
</head>
<body>
<h1>hello reactangle</h1>
<form id="main">
  <label>宽度：</label>
  <input type="number" id="width" min="0" autofocus required step="0.01">
  <span></span>
  <br>
  <div id="width-validate"></div>
  <label>高度：</label>
  <input type="number" id="height" min="0" required step="0.01">
  <span></span>
  <br>
  <div id="height-validate"></div>
  <input type="submit" id="calc" value="计算">
  <br>
  <label>周长：</label>
  <input type="text" id="perimeter" disabled>
  <br>
  <label>面积：</label>
  <input type="text" id="area" disabled>
  
</form>
<script src="//apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="./main.js"></script>
</body>
</html>
